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Planta Med. 2019 Nov 15. doi: 10.1055/a-1041-3406. [Epub ahead of print]

Scientists' Warning on Climate Change and Medicinal Plants.

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William L. Brown Center, Missouri Botanical Garden, St. Louis, MO, U. S. A.
Traditional Medicinals, Sebastopol, CA, U. S. A.
School of Veterinary and Life Sciences, Murdoch University, Murdoch WA, Australia.
Pharmacognosy and Phytotherapy, UCL School of Pharmacy, University of London, London, U. K.
Department of Pharmaceutical Science, Tshwane University of Technology, Pretoria, R. S. A.
Naturalis Biodiversity Center, Leiden, The Netherlands; Biosystematics Group, Wageningen University, The Netherlands.


The recent publication of a World Scientists' Warning to Humanity highlighted the fact that climate change, absent strenuous mitigation or adaptation efforts, will have profound negative effects for humanity and other species, affecting numerous aspects of life. In this paper, we call attention to one of these aspects, the effects of climate change on medicinal plants. These plants provide many benefits for human health, particularly in communities where Western medicine is unavailable. As for other species, their populations may be threatened by changing temperature and precipitation regimes, disruption of commensal relationships, and increases in pests and pathogens, combined with anthropogenic habitat fragmentation that impedes migration. Additionally, medicinal species are often harvested unsustainably, and this combination of pressures may push many populations to extinction. A second issue is that some species may respond to increased environmental stresses not only with declines in biomass production but with changes in chemical content, potentially affecting quality or even safety of medicinal products. We therefore recommend actions including conservation and local cultivation of valued plants, sustainability training for harvesters and certification of commercial material, preservation of traditional knowledge, and programs to monitor raw material quality in addition to, of course, efforts to mitigate climate change.

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Conflict of interest statement

The authors declare that they have no conflict of interest.

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